Pump.



J. MILBURN.

PUMP.

APLIoATIoN FILED 11,110.3. 19104 999,832, Patented Aug; 8, 1911.

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Specication of mettere Patent. .Pgammd Aug. 8, 1911.,

Application lex December 3, 1910. Serial No. 535,377.

To'all whom it fraay concern:

Beit known that i, JOSEPH MninUnN, a` citizen of the Dominion of New Zealand, and a resident of the city and county of San Francisco andState of California, have invented certain new and useful Improvements in Pumps, of which the following is a specification.

The invention relates to that class of pumps, generally known as diaphragm pum s, in which, a exible diaphragm isacte on by liquid pressure on one side to cause the volume in the casing on the other side of the diaphragm to be varied and thereby draw in and discharge the liquid to:

be pumped. This class of pumps is used rincipally to pump chemicals which vwould have a corroding action on the cylinder, or water containing certain materials in suspension which would lodge in the cylin-i der andv destroy its eiiciency. VIn a kpump of this class a pump cylinder, having a piston reciprocable within it, is in communication with a chamber which is divided into two, compartments by ,a 4iiexible diaphragm.- Liquid is employed in the cylinder below the iston and when the piston is reciprocate the flexing of the diaphragm causesv the ud to be pumped to be alternately drawn into and expelled from the chamber on the opposite side of the diaphragm.

Heretorore, as far as I am` aware, no means have been employed to rovent an excessive pressure on the lin er side of the diaphragm and in many instances where the quantity of liquid in the piston has been' excessive the dlaphragm has been rupturedn means for The object of this invention is to provide reventing Aany excess pressure on the diaphragm which may be dueto an excessive amount of liquid in the cylinder.,

Another object of the invention is to provide means for returninv totheunder side of the visten the iqui which may have leaked through between the piston and the cylinder and thereby maintain a substantially constant amount of liquid in the cyliner. Y A .A further object of the' invention is the provision of an improved communicating the diaphragmv at `those points.,

phragmchamber.

l/Vith these and other objects in view, as will more fully hereinafter appear, the invention consists of certain novel features of construction and arrangement of parts hereinafter fully described, illustratedin the accompanying drawings and particularly pointed outin the appended claims, it being understood that various changes in the form, proportions, size and minor details of the structure may be made 'without departing from the spiritfor sacrificing any of the advantages of the invention. A

Referring to the drawings: Figure l is a vertical section of thepump showing the method of arranging and attaching the improvements of my i vention. Fig. 2 is a detail of the liquid reservoir and the latch controlling the movement of the valve handle.`

Fig. 3 is a cross section of a larger scale of the communicating passage between the cylinder and the diaphragm chamber.

The pump consists of'a casing formed of a body 2 and a lcover 3 'between which is.

clamped the diaphragm c. Integral with the cover 3 is the cylinder 5 Within which the piston 6 is reciprocated by means of the handle 7 and the connecting links 8-9. The cylinder below the piston `is filled with passage between the cylinder 'and the diaa quantity of liquid, preferably oil, and the chamber and the cylmder has general-'ly consisted et a plurality o small haies -and the contact of the diaphragm 4: with .the edges of these holes has tended to raiily wear vention I employ a spider 15 having large openings 16 therein through which the liquid may ass with very small friction. To prevent t le diaphragm from coming in contact with these large openings 16 and being ruptured by the force of the suction, I provide a vertically moving valve 17, slidable in the spider and seatlng in a recess 18 therein when in its upper position. As the diaphragm is raised, it presses against the valve 17 and moves it to its seat, in which position it covers the openin s 16. By this arrangement, the diaphragm ears against a smooth surface and the liability toV rupture is overcome. v

Another important feature of tion is the means of filling the cylinder 5 .with the required amount of liquid and `maintaining that amount of liquid therein.

For this purpose I employ the valve 19 communicatin with the lower part or the cylinder 5. ounted on the valve 19 is the receptacle 21 into which the oil or liquid is placed, from whence 'it passes through the valve 19 into the cylinder. 'When the proper amount of liquid has been admitted, the valve 19 is closed. l

' To prevent the valve from being closed at any other time than when the piston is at the bottom of its stroke, I have arranged a latch which holds it locked in the open poopposite end 23 of the handle bears against a foot piece 24 on a bifurcated member which straddles the screw on the valve. The position of thisfoot piece 24 isl controlled by the spring held rod 25 which enters the upper art of the casing. The spring 26 normal y-holds the foot piece in the position indicated, and the valve is locked in the open position. When the piston 6 is at the bottom of its throw, the lug 27 on the link 9 depresses the rod25 so that the foot piece 24 is moved from the tongue 23 Aon the handle and the valve may be closed. This arrangement prevents an excessive amount of liquid from being admitted to the cylinder, which on the downward stroke of the piston would force the diaphragm against the port openings and cause its rupture.

Bv placing a supply of the liquid in the receptacle 21 and opening the valve 19, the amount of liquid in the'cylinder may be readily adjusted by, reciprocating the piston. As the pump is operated, a quantity of the liquid or oil will lforce its way be` hind the piston and to prevent the loss and wa ste of this liquid I have arranged a small drain pipe 28 leading from the upper part of the cylinder to the receptacle 21. The

my inven-v eeaaaa form the subject-matter of a prior application Serial No. 565,624` .filed June 7, 1910.

I claim:

1. In a pump of the character described, a casing having its interior divided into two chambers by a diaphragm, a ,cylinder mounted on the casing, a spider provided with openings arrangedv between the cylinder and the casing, 'and a plate suspended from the spider adapted to be moved by the diaphragm to cover said openings.

.2. In a pump of the character described, a casing having its interior divided'into two chambers by a diaphragm, a cylinder communicating with one chamber, a spider having a recessed under face arranged between the cylinder and the chamber, and a plate suspended from the spiderand adapted to 'be moved into said recess by the diaphragm.

3. In a pump of the character described, a casing having its interior divided` into two chambers by a diaphragm, a cylinder communicating with one chamber, a piston in said cylinder,H a filling valve on the cylinder below the piston and a receptacle mounted on said valve.

4. In a pump of the character described, a casing having its interior'divided into two chambersby .a diaphragm, a cylinder communicatin with one chamber, a piston in .said cylin er, a illing valve on the cylinder below the piston, a receptacle mounted on the valve and a conductor connecting the part of the cylinder above the piston with said. receptacle.

5. In a pump of the character described, a casing having its interior divided into two chambers by a diaphragm, a cylinder communicating with one chamber, a piston in the cylinder, a filling valve on the cylinder below the piston, and means for 'prevent-- ing the valve from being closed except .when thepiston is in the lowest position.

6. In a pump of the vcharacter described,

4a casing having its interior divided into two chambers by a diaphragm, a cylinder come municating with one chamber, a piston in the cylinder, a filling valve on the cylinder below the iston, a foot piece held in contact with the handle of the valve, a lugon Ithe piston driving means, and 'a rod sup rae porting the foot piece adapted to be dea handle for opening the valve and means'1o pressed by the lug when the piston is in for preventing the closing of the valve exthc lowest position. cept when the pistonis in the lowest posi- 7. In a pump of the character described, tion.

' a easing having its interior divided into' two l JOSEPH MILBURN.

chambers by a diaphragm, a cylinder communicating with one chamber, a piston iny Witnesses:

the cylinder, a filling valve on the cylinder .H. G. PROST, below the piston, a receptacle on said valve, P. S.. PIDWELL. 

